Add some basic benchmarking of the tracker

tests/README.md

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+### Running Benchmarks
+
+#### HTTP(S) Announce Peer + Torrent
+For this benchmark we use the tool [wrk](https://github.com/wg/wrk).
+
+To run the benchmark using wrk, execute the following example script (change the url to your own tracker url):
+
+    wrk -c200 -t1 -d10s -s ./wrk_benchmark_announce.lua --latency http://tracker.dutchbits.nl
+

tests/wrk_benchmark_announce.lua

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+-- else the randomness would be the same every run
+math.randomseed(os.time())
+
+local charset = "0123456789ABCDEF"
+
+function hexToChar(hex)
+    local n = tonumber(hex, 16)
+    local f = string.char(n)
+  return f
+end
+
+function hexStringToCharString(hex)
+    local ret = {}
+    local r
+    for i = 0, 19 do
+        local x = i * 2
+		r = hex:sub(x+1, x+2)
+		local f = hexToChar(r)
+		table.insert(ret, f)
+    end
+    return table.concat(ret)
+end
+
+function urlEncode(str)
+    str = string.gsub (str, "([^0-9a-zA-Z !'()*._~-])", -- locale independent
+            function (c) return string.format ("%%%02X", string.byte(c)) end)
+    str = string.gsub (str, " ", "+")
+    return str
+end
+
+function genHexString(length)
+    local ret = {}
+    local r
+    for i = 1, length do
+        r = math.random(1, #charset)
+        table.insert(ret, charset:sub(r, r))
+    end
+    return table.concat(ret)
+end
+
+function randomInfoHash()
+    local hexString = genHexString(40)
+    local str = hexStringToCharString(hexString)
+    return urlEncode(str)
+end
+
+-- the request function that will run at each request
+request = function()
+  path = "/announce?info_hash=" .. randomInfoHash() .. "&peer_id=-lt0D80-a%D4%10%19%99%A6yh%9A%E1%CD%96&port=54434&uploaded=885&downloaded=0&left=0&corrupt=0&key=A78381BD&numwant=200&compact=1&no_peer_id=1&supportcrypto=1&redundant=0"
+  headers = {}
+  headers["X-Forwarded-For"] = "1.1.1.1"
+  return wrk.format("GET", path, headers)
+end